Category Archives: Knowledge

How to architect Online Payment Processing System for an online store?

Source from So if you’ve decided to develop an On-line Payments system for your e-commerce I really advise you to read this short article. What aspects should I consider before building Payment Processing System? PCI DSS for Credit Card (CC) … Continue reading

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From CUTTING YOUR AWS EC2 BILL WITH LAMBDA FUNCTIONS When running a large training program for an investment bank, we needed over 30 EC2 instances, but only between certain hours of the day. This simple Lambda Function, cut our AWS … Continue reading

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Croke Park: Sound and weather data monitoring within a smart stadium Updated with a section on security and additional resources Boasting a capacity for 82,300 people, Ireland’s Croke Park stadium is one of the largest stadiums in Europe. As the national home to the Gaelic games and headquarters of the … Continue reading

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How to use PostMan to check Predix Service

Copy from Update a client $ uaac client update client_name –scope  acs.attributes.write,,acs.policies.write, After client update to refresh cache by next command $ uaac token delete If you need to change password of your client  you need to add password.write permission in scope and authorities of … Continue reading

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Run Umbraco CMS with Flexible Load Balancing on AWS

In version 7.3, Umbraco CMS the popular open source CMS introduced the flexible load balancing feature, which makes the setup of load-balanced applications a lot easier. In this blog post, we’ll follow the guidelines in the Umbraco documentation to set … Continue reading

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Cordova application architecture.

Overview Apache Cordova is an open-source mobile development framework. It allows you to use standard web technologies – HTML5, CSS3, and JavaScript for cross-platform development. Applications execute within wrappers targeted to each platform, and rely on standards-compliant API bindings to … Continue reading

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Java Programming Tutorial OOP Exercises

Reference from 1.1  Ex: The Circle Class (An Introduction to Classes and Instances) This first exercise shall lead you through all the basic concepts in OOP. A class called circle is designed as shown in the following class diagram. It … Continue reading

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